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Bikini underwear bottoms are so soft and cozy you won't even realize you're wearing your underwear. The Siren Bikini features our corespun merino wool blend for added strength and durability, while retaining next-to-skin softness. This style offers a modern fit of bulk-free comfort at the waist and leg openings, and the side seams are moved forward for chafe-free movement. Wear them under all your active wear or day to day denim, and find yourself most comfortable wearing them with the Siren Bra and our ultra soft Siren tops collection.\u003cbr\u003e\u003cul\u003e\n\u003cli\u003e83% Merino Wool, 12% Nylon, 5% Lycra Elastane\u003c\/li\u003e\n\u003cli\u003eImported\u003c\/li\u003e\n\u003cli\u003eWOMEN'S WOOL BIKINI UNDERWEAR: Perfect for daily wear or kicking back after a long day outside, this stretch-blend underwear features a flattering slim fit and forward set seams for all-day comfort\u003c\/li\u003e\n\u003cli\u003eWOOL UNDERWEAR FOR WOMEN: This wool bikini brief features jersey corespun fabric \u0026amp; nylon fibers for added strength, durability \u0026amp; next to skin softness Crafted of 83% merino wool, 12% nylon, 5% elastane\u003c\/li\u003e\n\u003cli\u003eMERINO WOOL LAYERS: Stay warm from head to toe in Icebreaker outdoor clothing gear Keep heads covered on the mountains, slopes, trials \u0026amp; lakeside with wool beanies, balaclavas, scarves, chutes \u0026amp; headbands\u003c\/li\u003e\n\u003cli\u003eWOOL \u0026amp; CASUAL: Whether skiing, camping, hiking or daily wear, Icebreaker provides clothes for men, women \u0026amp; children - keeping the whole family covered in jackets, beanies, scarves, sweaters, pants, leggings, underwear \u0026amp; more wool clothing\u003c\/li\u003e\n\u003cli\u003eICEBREAKER LONGEVITY: We use 85% merino wool \u0026amp; less synthetic material than the traditional outdoor standard With multi-purpose \u0026amp; timeless clothing our natural alternative to synthetics enhances the relationship between people \u0026amp; nature\u003c\/li\u003e\n\u003c\/ul\u003e"}

Icebreaker Women's Siren Bikini Underwear

$35.00
Icebreaker

Icebreaker Women's Siren Bikini Underwear

$35.00

Grivet Members get back an estimated $4 on this item as part of their member rewards.

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More from Icebreaker

Our Siren Bikini underwear bottoms are so soft and cozy you won't even realize you're wearing your underwear. The Siren Bikini features our corespun merino wool blend for added strength and durability, while retaining next-to-skin softness. This style offers a modern fit of bulk-free comfort at the waist and leg openings, and the side seams are moved forward for chafe-free movement. Wear them under all your active wear or day to day denim, and find yourself most comfortable wearing them with the Siren Bra and our ultra soft Siren tops collection.
  • 83% Merino Wool, 12% Nylon, 5% Lycra Elastane
  • Imported
  • WOMEN'S WOOL BIKINI UNDERWEAR: Perfect for daily wear or kicking back after a long day outside, this stretch-blend underwear features a flattering slim fit and forward set seams for all-day comfort
  • WOOL UNDERWEAR FOR WOMEN: This wool bikini brief features jersey corespun fabric & nylon fibers for added strength, durability & next to skin softness Crafted of 83% merino wool, 12% nylon, 5% elastane
  • MERINO WOOL LAYERS: Stay warm from head to toe in Icebreaker outdoor clothing gear Keep heads covered on the mountains, slopes, trials & lakeside with wool beanies, balaclavas, scarves, chutes & headbands
  • WOOL & CASUAL: Whether skiing, camping, hiking or daily wear, Icebreaker provides clothes for men, women & children - keeping the whole family covered in jackets, beanies, scarves, sweaters, pants, leggings, underwear & more wool clothing
  • ICEBREAKER LONGEVITY: We use 85% merino wool & less synthetic material than the traditional outdoor standard With multi-purpose & timeless clothing our natural alternative to synthetics enhances the relationship between people & nature

How To Measure Your Shoe Size

Here are the best shoe size conversion charts - in US, UK, European, and inches, for men's, kid's and women's shoes. 
 
If you've ever wondered "What size shoe is a 38?" (It is a men's size 7.5 in the US) or "What is a size 40 in shoes?" (that'd be a US men's size 9.5), read on to learn how to measure shoe sizes in different countries.
 
How do you measure shoe size? It is possible to measure your own foot using a ruler or a Brannock device, but since our feet our three dimensional, this will only approximate your measurements. After you've measured your foot, try using our conversion charts below to see what your size is. Be mindful that different brands, like Altra running shoes vs. Brooks running shoes vs. Oboz hiking boots, maybe run slightly different in sizes. 
 
Women's Shoe Size Conversions
US Sizes Euro Sizes UK Sizes Inches CM
4 35 2 8.1875" 20.8
4.5 35 2.5 8.375" 21.3
5 35-36 3 8.5" 21.6
5.5 36 3.5 8.75" 22.2
6 36-37 4 8.875" 22.5
6.5 37 4.5 9.0625" 23
7 37-38 5 9.25" 23.5
7.5 38 5.5 9.375" 23.8
8 38-39 6 9.5" 24.1
8.5 39 6.5 9.6875" 24.6
9 39-40 7 9.875" 25.1
9.5 40 7.5 10" 25.4
10 40-41 8 10.1875" 25.9
10.5 41 8.5 10.3125" 26.2
11 41-42 9 10.5" 26.7
11.5 42 9.5 10.6875" 27.1
12 42-43 10 10.875" 27.6

Men's Shoe Size Conversions

US Sizes Euro Sizes UK Sizes Inches CM
6 39 5.5 9.25" 23.5
6.5 39 6 9.5" 24.1
7 40 6.5 9.625" 24.4
7.5 40-41 7 9.75" 24.8
8 41 7.5 9.9375" 25.4
8.5 41-42 8 10.125" 25.7
9 42 8.5 10.25" 26
9.5 42-43 9 10.4375" 26.7
10 43 9.5 10.5625" 27
10.5 43-44 10 10.75" 27.3
11 44 10.5 10.9375" 27.9
11.5 44-45 11 11.125" 28.3
12 45 11.5 11.25" 28.6
13 46 12.5 11.5625" 29.4
14 47 13.5 11.875" 30.2
15 48 14.5 12.1875" 31
16 49 15.5 12.5" 31.8
Big Kid Shoe Size Conversions (7 – 12 years)
US Sizes Euro Sizes UK Sizes Inches CM
3.5 35 2.5 8.625" 21.9
4 36 3 8.75" 22.2
4.5 36 3.5 9" 22.9
5 37 4 9.125" 23.2
5.5 37 4.5 9.25" 23.5
6 38 5 9.5" 24.1
6.5 38 5.5 9.625" 24.4
7 39 6 9.75" 24.8
Little Kid Shoe Size Conversions (4 – 7 years)
US Sizes Euro Sizes UK Sizes Inches CM
10.5 27 9.5 6.625" 16.8
11 28 10 6.75" 17.1
11.5 29 10.5 7" 17.8
12 30 11 7.125" 18.1
12.5 30 11.5 7.25" 18.4
13 31 12 7.5" 19.1
13.5 31 12.5 7.625" 19.4
1 32 13 7.75" 19.7
1.5 33 14 8" 20.3
2 33 1 8.125" 20.6
2.5 34 1.5 8.25" 21
3 34 2 8.5" 21.6

FAQ & Tips

  • What if I am between shoe sizes? We recommend you should size up, especially in active & sports shoes. This includes running shoes and hiking boots. 
  • Does 0.5 size make a difference in shoes? Yes, it certainly does! Wearing shoes that are too small can cause pain and injuries. Blisters, lose of toenails and bunions can all result from wearing shoes that are even 0.5 size too small. These are common ailments of beginner runners. 
  • Is one foot bigger than the other? It is common for people to have one foot that is slightly bigger than the other. Our tip is that you should buy shoes that fit the larger foot (buy pairs of shoes in the larger size of the two). 
  • Should shoes be tight or lose? Unfortunately, this is not a simple question. Shoes should not be too tight or too lose. You should be able to put a thumbs width at the end of your toe box, between your big toe and the pointy end of the shoe. You should also be able to snuggly fit your index finger between your heel and the back of the shoe. If you have not much (or not enough!) space in either of these areas, try a different size shoe. 
  • When should I try on shoes? A great tip for runners is to try on running shoes at the end of a work day. As you run, just like when you are on your feet for work, your feet swell. You will want to try on running shoes when your feet are at their largest. This allows them to still fit comfortably after a long distance run. 
  • What size shoe should I buy? This shoe chart is not a guarantee your shoes will fit. If you are in the area of Memphis, Tennessee, run on in to one of our running specialty & gear stores and our experienced fit experts will help you out!

Image below: A Brannock device is one tool run specialists use to measure shoe size. It can measure not only foot length, but also foot width. 

How to measure shoe size - Brannock Device

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